For the pesto, finely chop the nuts. Wash the dill, shake dry and chop finely. Mix nuts, dill and oil, season with salt and pepper. Place in a bowl and chill.
For the soup, peel shallots and garlic and dice finely. Leave the crab soup paste and butter in a saucepan, sauté the shallots and garlic over a low heat. Dust with flour and sauté.
Gradually add 1 litre of water, fish stock and wine, always stirring and boiling repeatedly. Simmer at low heat for 2-3 minutes. Season to taste with salt, pepper and sugar. In the meantime whip cream with the whisk of the hand mixer.
Stir in the gin. Arrange the soup with crabs, a blob of gin cream and pesto in soup bowls.